Hi all, Had a go at installing my existing child seats in my new beast today with mixed results. I've been using imported isofix seats (illegally) for the last few years which are absolutely awesome. The rear-facing one for my 1-year-old clicks into the isofix attachments very nicely and I'm happy enough with that. The booster seat I have for my 4-year-old is a bit problematic though. It has 'surefix' clips that attach to the isofix adapters well (this one). The problem is that the isofix clips in the model s are displaced a little centrally and the seatbelt attachment ends up behind the seat which makes it very difficult to click in. I figured the best solution to this is to just get an Australian standard booster seat and use the top-tether rather than the isofix attachments. Hopefully this will be better centered on the seat and won't be dramatically more difficult to use than the surefix clips. I'm just wondering if anyone else has been using a booster seat with their Model S and has any recommendations or cautions.